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I have the same issue with 2017. I've tried repairing it, uninstalling and reinstalling but it just won't open. It formally says it has encountered a problem and I've sent along the requested log dump from the various attempts.

It's been a while since I opened the program so a Win10 update may be the culprit.

Same here but with Windows 7 Pro. HF Pro 2017 has launched in the past just fine. When I tried to launch again yesterday after a few months, I had added a SSD C drive in the interim, by the way, got the HitFilm "New Version" message but there was no description in the box so I tried to skip it and nothing happened. Checked the "Task Manager" and there seems to be multiple versions of HitFilm running. So I delete them and try again but nothing happens. I "Deactivated" HF, uninstalled and re-installed still nothing happens at launch...this is very bad! I'm a bit clueless anyway but this has got me.

Hmmm. I just reinstalled HitFilm Pro 2017 on my Win 10 Pro machine after having it completely overhauled (a brand new machine, mind you, where Microsoft updates corrupted the OS). It works fine, BUT. There is an error message that claims the program malfunctioned, specifically hitfilmclientrender.exe or something like that. Hit the close button, program continued to stay up, so I tried, first a simple image sequence and it rendered it fine. Then I went to a series of video sequences, and, ultimately, some heavy effects in comps. Everything rendered fine ...so far. Haven't tried it since the latest patches from MicroSoft, though.

I, like these folks, am not interested in buying the latest HitFilm Pro. I like 2017 and haven't even scratched the surface of mastering it, so I'm not going for bigger/better. I think it's all I need, and, hopefully, you folks will continue to support it. Meanwhile, though, there are these gremlins happening.

@Farscape have you tried the Demo of HitFilm 6? I'm not suggesting you should buy it, just try the free demo to see if this launches or not. It may help us identify the issue. Are you on Mac or Windows? What are your system specs? Have you got an Intel HD 530 or similar? We're currently trying to solve issues with this card on HitFilm 6. What is your exact driver version number?